update custom config file from file to template

tasks/configure.yml

@@ -23,7 +23,7 @@
     - haproxy restart
 
 - name: haproxy | copy custom configuration file
-  copy:
+  template:
     src: "{{ haproxy_custom_configuration_file }}"
     dest: '/etc/haproxy/haproxy.cfg'
     owner: root